36 Geological Survey of Alabama. 



subdivided by more shallow lines, closer set as the base is approached, but 

 nearly obsolete at apex ; lower extremity obliquely but broadly rounded ; 

 aperture rather large, nearly equal in width as far as shown. Inner lip 

 represented by an exceedingly thin lamina, reflected, showing in the type 

 a narrow, oblique umbilicus. 



Locality. Bunker Hill, La.; Jackson Group. 



This species is the largest yet described from the Southern Tertiary. 

 The specimen is partly a cast ; substance of shell is thinner than ordinary 

 writing-paper. The lines of growth and transverse stride are well shown 

 on cast. 



HAMINEA ALDRICHI, Langdon. 



Bulla (Haminea) Aldrichi, Langdon. Am. Jour. Sti., March, 1886. 

 BuUa biumbilicata, Mr. P. A. N. S., Philadelphia, 1884, fig. p. 110. 



Dr. Meyer's name is preoccupied by Deshayes' in Des Animaux sans 

 vertebres dans Le Bassin de Paris, Atlas, vol. 2, pi. 39, figs. 33, 34 and 

 35. It is quite likely, however, that this shell may prove to be the true 

 biumbilicata of Deshayes. 



PELECYPODA. 



TEREDO CIRCULA, n. sp. 



Consisting of a long, circular, shelly sheath, terminating at the smaller 

 end in two siphons, which are also nearly circular in section. These 

 siphons are partially separated in one specimen, and one is larger than 

 the other; substance of the sheath rather thick ; shell smooth at the outer 

 end and annulated and enlarged at the further end. Generally straight 

 or only slightly contorted. 



Localities. Choctavf Bluff, Ala., and Wayne County, Miss., in White 

 Limestone ; Vicksburg Group. 



Found boring in the limestone in great numbers, standing vertically ; 

 the valves not found. Mentioned in previous article as Aspergillum 

 tubes, but having since visited Choctaw Bluff and found the terminal 

 tubes, I have ventured to give it a name. No imbricated ledges found 

 in any of the specimens. 



PHOLAS ALATOIDEA, n. sp. PI 4, figs. 9, 9 b, 9 c. 



Shell elongate, cylindrical, posterior end concentrically striated, ante- 



